DENVER — Carlos Beltran didn’t do much of anything Monday on the Yankees’ off day here and went to bed feeling just fine.

He did not wake up that way.

“I woke up with my left knee a little swollen,” Beltran said. “I woke up and I looked at my knee and it looked kind of puffy in the front area . . . just super-stiff.”

And so, Joe Girardi kept the 39-year-old out of Tuesday night’s lineup and the rightfielder’s availability for Wednesday afternoon is in question.

“It’s a little worrisome,” Girardi said. “Because the one thing you don’t want it to become is a chronic thing, and we haven’t really had any problems with that knee.”

Beltran’s right knee has long given him issues — he had surgery on it in January 2010 — and he wears a brace on it, but his left knee has been relatively healthy.

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The veteran, coming off a homestand in which he went 9-for-26 with three homers and 11 RBIs, was to be checked out by the Rockies’ team doctor just before Tuesday night’s game.

“I’m not worried,” Beltran said.

Beltran, who leads the Yankees in homers (16), RBIs (44) and slugging (.554), said during the weekend he had just been talking in general about his knees.

“The one that has always given me problems is the right one,” he said. “The left one has always been the one good to me. I guess I talked too soon.”

Runs in the family

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In the 29th round of the just-completed draft, the Yankees took Bo Weiss out of Regis Jesuit High School (Colorado). Weiss, a 6-3, 175-pound righthander, is the son of Rockies manager Walt Weiss, a former teammate of Girardi’s (1994-95 with Colorado).

“Walt and I are close friends,” Girardi said. “Really neat. Walt’s a kid from New York (Suffern). Played against Walt, played with him, so pretty interesting.”